I have ran every light out there except for CFL, and right now I am running 1 room with 2000w HID and 2 rooms that are approximately 6'x6'x8' with 15 Pinnacle 300's (1 each for 2 plants) and 1 Viper 450 in a small closet. The reason that I went to LED in the 2 rooms and closet was primarily due to heat and energy consumption. The 1 room that I kept the HID is larger and can deal with the heat, which is a big concern with HID, plus energy cost. I know people will say that the Pinnacles and Viper are not COB's, and therefore not as good as it gets. Oh well, I don't have the best LEDS out there, but I find them to be pretty good in the terms of price and product produced. Anyway, to make a long story as short as possible, I would use an LED in a tent in a heartbeat, simply because of heat, not even counting amperage draw and cost, with is always a concern. BUT, as far as producing big plants and big buds, it is my belief that HID is the way to go. I like to grow big plants and with HID, I get 4' to 5' plants in a waterfarm system without a problem with a 5 week veg, whereas with the LED i'm lucky to get a 4' plant, which is a big difference as far as product produced. So that being said, if I was on a desert island with a choice of what light I could use without temp. height or energy consumption concerns, I vote HID, but if those conditions apply, LED would probably be a better choice. Oh, by the way I wouldn't put more than 6 plants in a 5x5 tent, your asking for trouble if you do. This is of course my own opinion.